Brake-controlling dashpot



T. W. WHATLEY.

BRAKE CONTROLLING DASHPOT.

. APPucAUoN man MAY 24,4921. xhsfgf,

Ptented Nov. 2L 1922.

gin/vento? nos. w. www@ @www ToAaZZ whomz't may concern.'

Patented Nov. 2l, llgl entran iff: anni@ im* s" *frs 4 BRAKE-commonwenasi-tros'.

Application kfilerlrlMay 24,

j Be itknown that 1,1HoMAs W. WnE'AT.- LEY, a citizen of the United States, residing at Shickshinny. in the rerountyot Luzerne,

and Statel of Pennsylvania, have inventedi certain new and useful lnuirovementg in Brake-Controlling Dashpots; and I hereby declare that the following isa full, clear, and exact description thereof, reference being had r,to thevjaccompanying drawings, which form part of the speciication.

My invention relates to brake controlling dash-pots.

An object of my device is to provide a device containing liquid, air or gas 'for regulating the pressure exerted upon a brake.

Another object is to provide resilient :torce for applying pressure to a brake of an automobile or other vehicle.

Still another` object is to provide means for regulating the pressure applied.

In the accompanying drawing Fig. 1 shows the parts ot my device in cross section. Fig. 2 is a detailed view of valve member 2O showing annular groove 22. Fig. 3 is a section taken on the line 3-3 of Fig. 2.

Referring more particularly to the drawings 1 denotes a rod leading to an eccentric or other brake-operating means not shown. 2 denotes a threaded bolt i'or connection to piston rod 3, and said rod is threaded at et and formed with shoulders 5 which are adopted to bear against disk 9, and said thread 4 to engage with internal thread @Z in solid disk 13. 6 denotes a cylinder-head threaded internally at 7 and provided with vent-ports 8 opening into cylinder 14:. 9 denotes a solid disk adapted to tit inside a cup washer 10. 11 denotes a solid disk adapted for movement in cylinder 14C. 12 denotes a cup washer similar in construction to cup washer 10 but assembled in reverse position thereto, solid disk 11 interposing as shown in Fig. 1. 13 denotes a solid disk adapted to tit inside of cup washer 12 provided with an internal thread for engagement with thread 4 on rod 3. 111;v denotes a cylinder having exterior thread 15 registering with thread 7 of cylinder head 6. Leading from said cylinder is a pipe 16 having pet cock 17 embracing the conventional handle 18 and passage 19. 20 denotes a pet cock having a handle ball 21 the stem ot' said cock is provided with the usual passage 23 and a passage 22 ot small diameter termed 19121. Serial N10. 472,059.

I in said,` stem at right angles ,topassage 22.

Saidpassages are connected by` a U-shaped groove24 `circumferentialy ot the stein as shown in Figs.`2 and 3. 25 denotes a vtank of rubberl or other rresilient material attached l to said pipe16 by `wires c. `26 denotes pipe connected to pipe 16 having a pet cock27 with conventional handle 28. The `end ot this pet. cock isthreaded at29 for `detachable .connectionto aliquidpor gas iilledre-l ceptacle not shown, e denotes nuts for holding and adjusting the pet cock stems and f friction washers for same.

The letters a denote holes for passage of rod 3 through disks 9 and 11 and washers 10 and 12. The hole b in cylinder head 6 is large enough to allow the major portion ot piston rod 3 to play treely therein.

To operate my device a liquid or gas is first forced into tank 25 through pipe 26, pet cock 27 being open; this pet cock is then closed. Vith cocks 2O and 17 being open as shown in Fig. 1, the piston will be forced outwardly the air in the cylinder escaping through vents 8. Pressure in tank 25 being thus diminished any pressure on rod 3 would 'torce the piston back to its iirst position. Pressure being in the tank, cock 17 open, and cock 2() closed there would only be the small passage way 22 shown in Fig. 3 ior the pressure to pass into the cylinder. ln this connection it will be noticed that by my construction ot the stem ot cock 20 having the U-shaped y circumferential trough, there is at all times a suilicient leakage ot' pressure to cause more or less pressure back ot the piston. liVhen it is desired to stop all movement of the piston cock 17 is turned ott'.

TVVhen pet cock 17 is open l can regulate my piston by pet cock 20. Small hole 22 causes the piston to move slowly because the fluid or gas has to be pulled and pushed therethrough. By swinging the ball lever or handle 21 l turn the large hole into registration with the pipe 16, this allows the liquid or gas tree ingress and egress 'trom the cylinder 7 thus relieving the brakes. By releasing ball 21 it drops by gravity and the small hole 22 registers with pipe 16 thus causing the piston to move very slowly and by turning pet cock 17 the piston can be stopped entirely.

It will be seen that tank 25 being made oi? rubber or other elastic material Aforms an important part ot my device because as the liquid or gas is drawn into the cylinder no suction accrues in the tank. As the liquidis drawn out of the tank by the upstroke of the piston the tank collapses With the vatmospheric pressure and When returned by the down stroke it again expands.-

When using air pet cock ,Q6-is left open and the tank does not function.

It Will be seen from the foregoing that my device consists of a cylindercontainin'g a loosely fitted piston, a cylinder partly'filled With fluid,V gas or air, designed to check by means of an eccentric or other braking means not shown, the turning of a shaft or Wheel and to apply such pressure in varying degrees, thus avoidingv sudden clamping of brakes and dragging of Wheels When applied to an automobile orthe like. y l

It Will be further seen that by using` a viscous liquid, gas or air, the resistanceofered prevents a sudden movement of the brake to Which the piston isqattac;hed.`

Claim: A brakecontrolling mechanism embracing a cylinder having air exitvents at one end a pressure pipe 'at the opposite end havv opening into 'a circumferential `Ush`apedi` groove formedon the surfaceor` said stem and av weighted handle for operating saidl valve.

In testimony thatl claim the,foregoingas` my own, I aflix my signature.

THOMAS W. WHEAT-Lu- 

